<template>
        <el-container class="home-container">
        <!--头部区域-->
        <el-header>
            <div>
                <img src='@/assets/eason.jpg'>
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!--页面主体区域-->
        <el-container>
            <!--页面侧边栏-->
        <el-aside :width="isCollapse ? '64px' : '200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!--侧边栏菜单区-->
            <el-menu
            background-color="#333744" text-color="#fff" active-text-color="#409EFF" 
            unique-opened :collapse="isCollapse" :collapse-transition="false" :router="true"
            :default-active="activePath">
            <!--一级菜单-->
            <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                <!--一级菜单的模板区域-->
            <template slot="title">
                <!--图标-->
                <i :class="iconObj[item.id]"></i>
                <!--文本-->
                <span>{{item.authName}}</span>
            </template>
                <!--二级菜单-->
                <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subItem.authName}}</span>
                </template>
                </el-menu-item>
            </el-submenu>
        </el-menu>
        </el-aside>
        <!--页面主体-->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
        </el-container>
        </el-container>
</template>

<script>
    export default {
        data() {
            //左侧菜单数据
            return {
                menulist: [],
                iconObj: {
                    '125': 'iconfont icon-users',
                    '103': 'iconfont icon-tijikongjian',
                    '101': 'iconfont icon-shangpin',
                    '102': 'iconfont icon-danju',
                    '145': 'iconfont icon-baobiao'
                },
                //是否折叠
                isCollapse: false,
                //被激活的链接地址
                activePath: ''
            }
        },
        created() {
            this.getMenuList()
            this.activePath = window.sessionStorage.getItem('activePath')
        },
        methods: {
            logout() {
                window.sessionStorage.clear();
                this.$router.push('/login')
            },
            //获取所有菜单
            async getMenuList() {
               const {data: res} = await this.$axios.get('menus');
               if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
               this.menulist = res.data;
               console.log(res)
            },
            //点击按钮，切换菜单的折叠与展开
            toggleCollapse() {
                this.isCollapse = ! this.isCollapse
            },
            //保存菜单激活状态
            saveNavState(activePath) {
                window.sessionStorage.setItem('activePath', activePath)
                //重新赋值
                this.activePath = activePath
            }
        }
    }
</script>

<style lang="less" scpoed>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    //按钮在header中心
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}

.el-menu{ 
    border-right: none;
}

.el-aside{
    background-color: #333744;
}

.el-main{
    background-color: #EAEDF1;
}

.iconfont {
    margin-right: 10px;
}

.toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    cursor: pointer;
    letter-spacing: 0.2em;
}
</style>